Sinclair has struggled since his excellent first season at Celtic.
Brendan Rodgers’s Celtic will face Aberdeen at Celtic Park in the Scottish Premiership this afternoon.
Steven Gerrard’s Ibrox club Glasgow Rangers sold Liam Kelly to Livingston in the summer transfer window.
Celtic are going through a tough patch under Brendan Rodgers.
Celtic beat Rangers 1-0 on Sunday in the first Old Firm derby of the season.
Celtic won't be in the Champions League this season.
Celtic were knocked out of the Champions League on Tuesday night.
Celtic face newly-promoted Livingston, while Rangers go up against Aberdeen.
Brendan Rodgers’s Celtic won against Graeme Murty’s Glasgow Rangers on Sunday.
Charly Musonda joined Brendan Rodgers’s Celtic on loan from Chelsea in the January transfer window.